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1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 566
Design of Temperature Data Logger Using Thermocouple
Wahyudi1, Raditya Naufal Fathoni 2, Imam Santoso3
1,2,3 Department of Electrical Engineering, Diponegoro University, Semarang, Indonesia
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Abstract -There are various ideas emerge to help human
works, one of them is a modern computer-based recording
device with a soft file as the result, which can be opened using
a computer to replace the conventional one. This paper
delivers a temperature recording method by a type-K
thermocouple using a data logger prototype. The tools and
materials that are being used are a type-K thermocouple, a
MAX6675 module, an Arduino Uno board, and an Arduino
Data Logger Shield. The system was beingtestedwithcreating
a folder, a subfolder, and a file on SD Card. The recording
result will be a .csv type file that can be opened using a
spreadsheet like Microsoft Excel. In the end, type-K
thermocouple and MAX6675 module areabletoreadandsend
the input data to Arduino Uno, and the proposed data logging
system is able to process and save the data from the sensor as
a whole, and the recording file can be opened on a computer,
with a folder, a subfolder, and a file using the intended format.
Key Words: Data logger, Type-K Thermocouple, Arduino
Uno, MAX6675, SD Card
1.INTRODUCTION
In this modern era, conventional recording method (writing
on a sheet of paper) is rarely used anymore. Various ideas
have been introduced to make a modern and up to date, one
of them is a recording method that is computer-based with a
soft file as a result which can be opened using a computer.
Information on temperature measurement results of a
process can be done [1–3] by monitoring and data logger [4–
6]. Because of that, an idea comes to make an automatic
temperature recording device that relies on microprocessor
and SD Card as the data storage. The proposed temperature
recording device uses an Arduino UNO board that is
connectedwithatype-Kthermocouple,atemperaturesensor,
and an SD Card to save the processed data by the system.
Several methods used for calculating temperature
measurements have been proposed [7-8] and error
correction calculations have been carried out [9].
This paper proposed system uses data logging principle,
where the data collecting, processing, and recording is being
done in a device that is not connected to a computer and has
own data storage system.
This paper provides a temperature recording method by
type-Kthermocouplesensor usinganautomatic temperature
recording device. The recording system result will be a .csv
file which can be opened using the spreadsheet Microsoft
Excel.
2. METHODOLOGY
2.1 Tools and Material
Fig -1: Thermocouple cross-section.
In the core, thermocouple consists of a pair of hot and cold
transducer which is connected and melted together, where
the difference on this junction will be compared with the
reference junction. The thermocouples with the type E, J, K
dan T are metal-based thermocouple and can be used to
measure temperature up to 1000°C (1832°F). Type S, R, and
B thermocouples are noble-metal thermocouplesandcanbe
used to measure temperature up to 2000°C (3632°F).
MAX6675 module is a tool that compensates the cold-
junction and digitalize the signal from type-K thermocouple,
can be called as a signal amplifier. The output data will have
a 12-bit resolution, SPITM-compatible, andread-only format
[11].
This converter has the measuring resolution of0,25oC,
enables measuring up to +1024oC, and has the 8LSB
thermocouple accuracy for measurement from 0oC to
+700oC. Fig -2 shows pin configuration of MAX6675 module
[11]. Arduino Unois microcontroller-based board, using an
ATmega328 which has 14 digital input/outputpins(where6
pinscan be used as PWM output),6analoginputpins,16MHz
oscillator crystal, type B USB jack, DC voltage input jack, and
a reset button.
Thermocouple temperature sensor is a thermoelectric
temperature sensor that consist of two differentmetal wires
(ex. chromel and constantan) that is being connected onthe
probe tipand the reference junction. Fig -1 shows
thermocouple cross-section [10].

2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 567
Fig -2: Pin configuration ofMAX6675 module.
These pins consist of everything needed to enhance the
microcontroller. Fig -6 shows the Arduino Uno physical
figure, and Arduino Uno specification is shown at Table 1
[12].
Fig -3: Arduino Uno physical figure
Table -1: Arduino Uno specification.
Component Type Specification
Microcontroller ATmega328
Operation voltage 5 Volt
I/O 14 pins (6 pinsfor PWM)
Current 50 mA
Flash Memory 32 KB
SRAM 2 KB
EEPROM 1 KB
Arduino Data Logger Shieldis a tool used to do thedata
logging functions. It connects the Arduino with anSD
Cardand aReal Time Clock (RTC) . This shield providessome
features:
 Able to use any SD cardwith a FAT16 or FAT32format.
3.3V level shifter circuit enables fast data reading and
writing, and prevents damages on SD Card.
 Real Time Clock (RTC) ensures the time will still begoing
even when the Arduino board is not connected to a
power source.
 3.3V voltage on-board regulator can be used as the
reference potential (Vref) and to power up the SD card
that needs a lot of power to work.
 Using an “R3 layout” for I2C dan ICSP SPI ports, so it will
suit many types of Arduino board.
Fig -4 shows Arduino Data LoggerShieldphysical figure[13].
Fig -4: Arduino data logger shieldphysical figure.
2.2 Data Logger Design
The data logger design as a whole is represented by the
block diagram on Fig -5.
Fig -5: Data logger design diagram block.
The temperature data logger is design using a type-K
thermocouple sensor with an amplifier circuit and an
Arduino board. The type-K thermocouple senses the room
temperature changes, and sends an electric signal to the
amplifier, who will amplify the signal and sends it to the
Arduino. After the Arduino receives thesignal,thesignal will
be processed into a data that will be written onto the SD
Card in a file with .csv format which can be opened using a
spreadsheet application, like Microsoft Excel. The data
writing will stop and create a new file when the data logger
is being restarted or turned off. The program was made

3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 568
using Arduino IDE with a Windows operating system. The
data logger wiring is shown by Fig -6, and the physical figure
of the data logger is shown by Fig -7.
Fig -6: Data logger wiring.
Fig -7: Physical figure of the data logger.
The type-K thermocouple that is being used were calibrated
by comparing the thermocouple measuring result with a
digital thermometer. The type-K thermocouple calibrating
result is shown by Table -2.
Tabel -2: Type-K thermocouple calibrating result.
Thermometer
reading
(oC)
Thermocouple
voltage output
(mV)
Thermo-
couple
reading (oC)
Error
(%)
30 1.203 27 10
34 1.366 35 2.85
42 1.694 42 0
53 2.147 53 0
64 2.602 64.5 0.77
72 2.934 70 2.7
74 3.017 73 1.35
80 3.267 79 1.25
102 4.179 102 0
Average 2.1
3. RESULTS AND DISCUSSION
The system was tested by creating a folder, a subfolder, and
a file on the SD Card, then monitor it using a computer if the
SD Card works well. Fig -8 shows successful folder making,
Fig -9 shows successful subfolder making, Fig -10 shows
successful file making, and Fig -11 shows the content of the
created file.
Fig -8: Successful folder making.
The first step done by the data logger system is making a
folder, where the folder has been arranged to show the year
when the system is being used.
Fig -9: Successful subfolder making.

4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 569
The second step done by the data logger system is making a
subfolder, where the subfolder has been arranged to show
the month in numeric when the system is being used.
Fig -10: Successful file making.
The third step done by the data logger system is making a
file, where the file has been arranged to show the date and
clock when the system is being used on its title.
Fig -11: Content of the created file.
In the file made by the data logger, therecordingresultinthe
working period by the data logger can be seen. The
recording was done in order with a minute interval until the
device is turned off.
4. CONCLUSIONS
Type-K thermocouple and the MAX6675 module workswell
on reading and giving the inputs to Arduino Uno
microcontroller. The proposed data logger succeeds in
processing and saving the data from the sensor completely.
The data logger file can be opened on a computer with the
wanted folder, subfolder, and file formats.
REFERENCES
[1] J. Kanetake, Y. Kanawaku, and M. Funayama,
“Automatic continuous monitoring of rectal
temperature using a button-type thermo data
logger,” Leg. Med., vol. 8, no. 4, pp. 226–230, 2006,
doi: 10.1016/j.legalmed.2006.04.001.
[2] P. Foltyński et al., “Continuous monitoring of feet
temperature using a data logger with wireless
communication,” Biocybern. Biomed. Eng.,vol.32,no.
4, pp. 59–64, 2012, doi: 10.1016/s0208-
5216(12)70049-9.
[3] I. Kwon and T. Kim, “Monitoring the effect of water
temperature on the heart rate of olive flounder (
Paralichthys olivaceus ) using a bio-logger,”
Aquaculture, vol. 575, no.December2022,p.739739,
2023, doi: 10.1016/j.aquaculture.2023.739739.
[4] P. R. Kamerman, L. C. Di Zio, and A. Fuller, “Miniature
data loggers for remote measurement of body
temperature in medium-sized rodents,” J. Therm.
Biol., vol. 26, no. 3, pp. 159–163, 2001, doi:
10.1016/S0306-4565(00)00037-1.
[5] M. Trezona and K. L. Moore, “75. pH/temperature
loggers accurately measure muscle pH and
temperature decline of pork carcasses,” Anim. - Sci.
Proc., vol. 12, no. 2, p. 237, 2021, doi:
10.1016/j.anscip.2021.09.160.
[6] M. Pfender and H. Villinger, “Miniaturized data
loggers for deep sea sediment temperature gradient
measurements,” Mar. Geol., vol. 186, no. 3–4, pp.
557–570, 2002, doi: 10.1016/S0025-
3227(02)00213-X.
[7] M. H. Nguyen, S. E. Ouldboukhitine, S. Durif, V.
Saulnier, and A. Bouchair, “Method of measuring the
temperature of wood exposed to fire with type K
thermocouples,” Fire Saf. J., vol. 137, no. January,
2023, doi: 10.1016/j.firesaf.2023.103752.
[8] R. S. Volkov and P. A. Strizhak, “Methodology to
calculating the temperature around an evaporating
droplet using a set of thermocouples,” Measurement,
vol. 218, no. January, p. 113030, 2023, doi:
10.1016/j.measurement.2023.113030.
[9] X. Li, Q. Huang, X. Luo, and P. Wang, “Thermocouple
correction method evaluation for measuring steady
high-temperature gas,” Appl. Therm. Eng., vol. 213,
no. October 2021, p. 118673, 2022, doi:
10.1016/j.applthermaleng.2022.118673.

5. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 570
[10] H. Lundström and M. Mattsson, “Modified
thermocouplesensorandexternal referencejunction
enhance accuracy in indoor air temperature
measurements,” Sensors, vol. 21, no. 19, 2021, doi:
10.3390/s21196577.
[11] A. Com, “MAX6675 Datasheet ( PDF ) - Maxim
Integrated Products Similar Part No . - MAX6675,”
pp. 6–8.
[12] P. R. Manual, “Arduino UNO R3 Features,” pp. 1–13,
2022.
[13] B. Earl, “Adafruit Data Logger Shield,” Adafruit Ind.,
pp. 1–85, 2017, [Online]. Available: https://cdn-
learn.adafruit.com/downloads/pdf/adafruit-data-
logger-shield.pdf